Imaging System with Dynamic Drive and IPSF Selection
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Solution Overview
Problem
Existing imaging systems, particularly in microscopes and endoscopes, face limitations in extending the depth of field while maintaining image resolution, as techniques like focal sweep imaging fix the relationship between depth of field extension and resolution, and insufficient studies have been conducted on restoring images captured by focal sweep using lighting.
Innovation Solution
An imaging system comprising an imaging optical system, a two-dimensional pixel array, a drive unit for the focus lens and imaging element, an IPSF selection unit, and an image generator that selects and integrates point spread functions to generate images with an extended depth of field, allowing adjustable resolution based on imaging distance through specific drive patterns and IPSF selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If focal sweep imaging is performed by shifting the imaging element along the optical axis during exposure, then the depth of field is extended, but the resolution cannot be adjusted according to the imaging distance
Solution Approach 1:
The patent implements dynamic control of the imaging element's position during exposure by applying a time-varying drive pattern (sinusoidal or triangular wave) that adjusts the imaging element's location along the optical axis. This dynamic positioning enables the system to adapt resolution to different imaging distances while maintaining extended depth of field, resolving the contradiction between fixed resolution relationships and adjustable resolution requirements.
Solution Approach 2:
The patent changes the drive parameters (amplitude, frequency, waveform type) of the imaging element to optimize the balance between depth of field extension and resolution maintenance. By adjusting these parameters based on imaging distance and subject requirements, the system can dynamically optimize both depth of field and resolution, making the resolution adjustable according to imaging conditions.
2Length of stationary object
If the imaging element is driven during exposure to extend depth of field, then pan-focus images are obtained, but insufficient studies have been made on restoring images using lighting
Solution Approach 1:
The patent performs preliminary actions by pre-planning the drive pattern of the imaging element and pre-coordinating the illumination timing and intensity. The illumination is synchronized with the imaging element's position during the sweep, ensuring optimal lighting conditions are maintained throughout the exposure period. This preliminary coordination enables high-quality image restoration without requiring post-processing corrections.
3Device complexity
If a fixed relationship between depth of field extension and resolution is used, then simple focal sweep imaging is achieved, but the resolution cannot be optimized for different imaging distances
Solution Approach 1:
The patent transitions from fixed to dynamic control by implementing time-varying drive patterns for the imaging element. The system dynamically adjusts the imaging element's position during exposure based on the desired imaging distance and resolution requirements. This dynamic approach maintains relatively simple device architecture while achieving optimized resolution for different imaging scenarios.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the acquisition of images with an extended depth of field and adjustable resolution, suitable for detailed observation in endoscopic examinations by optimizing the drive patterns and IPSF selection, enhancing the ability to observe internal body images with higher resolution at specific imaging distances.
Implementation Method 1
an imaging optical system; an imaging element having a two-dimensional pixel array
Implementation Method 2
a drive unit that drives at least one of a focus lens and the imaging element during the exposure period
Data Source
AI summary
An imaging system includes: an imaging optical system; an imaging element having a two-dimensional pixel array; a drive unit that drives at least one of a focus lens and the imaging element; an IPSF selection unit that selects an IPSF that is used for image generation from among a plurality of IPSFs stored in an IPSF storage unit; and an image generator that generates an image using the selected IPSF.